Horizontal turbine-pump.



F. W. KROGH.

HORIZONTAL'TURBINE PUMP.

APPLICATION FILED APR. 15. 1913.

. 1 1%6 79 Pafented July 13, 1915.

2 SHEETS-SHEET I.

INVENTOR raw/Wm ATTORNEY F. W. KROGH.

HORIZONTAL .TURBINE PUMP.

APPLICATION FILED APR. 15, 1913.

1,14 0% Patented July 13,1915.

2 SHEETS-SHEET 2.

WITNESSES INVENTOR fifmm $112311 23.1fm I Y ATTORNEY; I

inaaora;

FERDINAND w. imoen, or SAN FRANCISCO, CALIFORNIA.

HORIZONTAL runBIIvn-Pum.

. Application filed April 15. 1913.

To all whom it may concern Be it known that I, FERDINAND W KROGH, of San Francisco, California, have invented 'certain new and useful Improvements in Horizontal Turbine-Pumps, whereof the following is a specification.

' My invention relates to the art of balancing centrifugal pumps to avoid longitudinal thrusts against limiting collars as ordinarily used, and especially to pumps which use water pressure createdby the impeller itself to produce the required result.

The object of my invention is to provide in centrifugal pumps new and improved means for automatically regulating the water pressure between the stationary and moving parts, otherwise .:called the casing and the impeller," for the purpose mentioned above. I

With the above object in view my invention consists in a pump comprising a casing and an impeller, having annular chambers along the area of contact between the impeller and the inner walls of the casing, leakage running joints between the water-receiving space in the casing and said chambers, and new and improved devices on the casing and on the impeller, for automatically destroying and creating pressure in said annular chambers according to the position of the impeller in the casing.

It also consists in the novel parts, combinations, and arrangements, set forth in the following description, particularly pointed out in the claims, at the end hereof and illustrated in the accompanying two sheets of drawing, of which,

Figure 1, p is a .vertical central section through a centrifugal pump showing the annular chamber located in this form of my device in the casing, and one arrangement of the auxiliary device for destroying and creating pressure in the chambers. Fig. 2, is a sectional view taken along the line a? Fig. 1. Fig. 3, is a sectional viewtaken along the line c-ci, Fig. 1. Fig. 4, is a view similar to Fig. 1, ut showing a second form of the so-called auxiliary device. Fig. 5, is a similar view showing a third form of the auxiliary device, and Fig. 6, is a similar view showing a fourth form of the auxiliary device.

Specification of Letters Patent.

Patented July 13, 1931.5.

Serial No. 761,201.

casing, G the impeller and D the shaft. Annular projections 1, 1 and 2, 2 extend inwardly from the casing, spaced apart to form annular chambers 3, 3, 1, 1 forming leakage joints with the'impeller, and 2, 2 being given a close running fit therewith. In the impeller, annular grooves 4, 4: are provided which communicate with the holes 5, 5 opening into the joints 6, 6' between the casing and the impeller. I Annular 3 A is a centrifugal pump, of which B is the grooves 7, 7 which may take the place of the leakage joints and render them unnecessary, are provided in the projecting rings 1 and 1' which communicate through a plurality of holes 8 and 8', with the waterreceiving space of the casing. A series of holes 9 and 9 in the ring 2 communicate be, tween the chambers 3 and 3 and the Water space, when registering with holes 5 and 5 and grooves 4 and 4'.

The operation of the device is as follows: If the longitudinal thrust is toward the left, the outfiowing water from the impeller draws the water from the chamber 3 as soon as holes 5 register with holes 9, through said holes and grooves 4' thus reducing the left hand pressure from chamber 3.. Chamber 3 which has been receiving water under its highest pressure from the casing through holes 8, annular groove 7, leakage joint, annular holes 10 and grooves 4, react against the movement of the impeller, and tend to thrust it back. If the backward movement is too great, holes 5 and 9 will register and the passing Water in the intake 11 will draw ofi the water from chamber 3, reducing the pressure therein, the same cycle of operations continuing until the impeller comes to rest in a balanced condition.

In Fig. 4: the annular chambers 3 and 3 smaller and the suction is arranged by withdrawing the impeller rings out of the chambers 3 and 3 instead of causing registration between holes like 5 and 9, for instance. The mode of operation is the same as above described for the first shown form of my device.

In Fig. 5, the chambers 3 and 3 are lo cated in the impeller C, annular projections 12 and 12 on the casin taking the place of the annular extension om the impeller shown in previous figures The aux iliary suction device is here similar to that shown in Fig. 4:, relative motion between ring 12 or ring 12 and the impeller causing its entire withdrawal from the chamber 3 or 3, and opening communication between chamber 3 or 3 with the passing water.

In F ig; 6, the chambers 3 and 3' are again located in the casing, but the annular projections 12 and 12 are located on the impeller, differing from Fig. 4 for instance by omitting the grooves 4 and 4, dependence being placed on the leakage joints 14 and 14 to leak *suiiicient water into the chambers 3 and 3 without auxiliary passages, a form of construction indicated in some cases. The mode of operation is the same as above described for the previously explained constructions.

Having thus described my invention and believing I have produced useful and novel improvements in the art to which it appertains'let it be understood that I do not wish to be limited to the exact construction and arrangement of the several parts composing the same as many changes can be made without departing from the spirit thereof, but

What I claim and desire to secure by United States Letters Patent is 1. In combination, the casing .of a horizontal centrifugal pump and the impeller therein, two annular concentric walls projecting inward from the casing and forming an annular chamber between them, and a neck projecting axially from the impeller between said walls and forming a fourth and movable side to said chamber whereby areaore the impeller is automatically centralized in the casing.

2. In combination with the casing of a centrifugal pump and the impeller therein, annular lateral chambers in said casing provided with internal grooves and passages, laterally projecting necks on said impeller rotating in said chambers and provided with passages registering with said grooves and passages.

3. In combination with the casing of a centrifugal pump and the impeller therein, annular lateral chambers in said casing pro vided with side passages, laterallyprojecting necks on said impeller rotating in said casing chambers, annular chambers in said necks communicat ng with said casing chambers and provided with passages registering with said casing passages and communicating with the chambers thereof and adapted to create pressure therein.

In testimony that I claim the foregoing I have hereto set my hand this 8th day of April, 1913, in the presence of witnesses.

FERDINAND Witnesses:

B. CHESTER, O. PoULsnN. 

